Mechanical Operations Archives

Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?

Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________?

A. Separation of isotopes based on their density or molecular weights difference
B. Concentration of rubber latex
C. Separation of cream from milk
D. Dewaxing of lubricating oil

Ultracentrifuges running at speeds upto 100000 rpm is normally used for the_____________________? Read More »

Mechanical Operations

Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?

Mechanical Operations / admin

Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?

A. Added to the feed slurry
B. Pre-coated on the filter medium prior to filtration
C. Separated from the cake by dissolving solids or by burning it off
D. All A, B. & C.

Mechanical Operations

Trommels are revolving screens which normally operate in the range of _______________ rpm?

Mechanical Operations / admin

Trommels are revolving screens which normally operate in the range of _______________ rpm?

A. 1 – 2
B. 15 – 20
C. 40 – 50
D. 60 – 75

Trommels are revolving screens which normally operate in the range of _______________ rpm? Read More »

Mechanical Operations

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?

Mechanical Operations / admin

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?

A. 6/D.ρ
B. 2/D.ρ
C. 4/D.ρ
D. 12/D.ρ

The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ? Read More »

Mechanical Operations

For sizing of fine materials, the most suitable equipment is a____________________?

Mechanical Operations / admin

For sizing of fine materials, the most suitable equipment is a____________________?

A. Trommel
B. Grizzly
C. Shaking screen
D. Vibrating screen

For sizing of fine materials, the most suitable equipment is a____________________? Read More »

Mechanical Operations

The main differentiation factor between tube mill and ball mill is the ___________________?

Mechanical Operations / admin

The main differentiation factor between tube mill and ball mill is the ___________________?

A. Length to diameter ratio
B. Size of the grinding media
C. Final product size
D. Operating speed

The main differentiation factor between tube mill and ball mill is the ___________________? Read More »

Mechanical Operations

During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?

Mechanical Operations / admin

During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?

A. Density of the liquid
B. Viscosity of the liquid
C. Cube of impeller diameters
D. Square of rotational speed

During agitation of liquids, power consumption during laminar flow is not proportional to the ________________? Read More »

Mechanical Operations

In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?

Mechanical Operations / admin

In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced?

A. Concentrate
B. Tailing
C. Middling
D. None of these

In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called _____________ is produced? Read More »

Mechanical Operations